D. I hope you have a good morning
- Josie Annette
Fifteen points! Nothing like chemistry quizzes in the morning... >o<
Match the acids and bases to their correct type.
H²CO³ A. Monoprotic Acid
HCI B. Diprotic acid
NH₄OH C. Triprotic Acid
H₃PO₄ D. Monoprotic base
Ba(OH)₂ E. Diprotic base
Answer:
Explanation:
HA(aq)+H2O(l)⟺H3O+(aq)+A−(aq)(1)
you need to solve for the Ka value. To do that you use
Ka=[H3O+][A−][HA](2)
Another necessary value is the pKa value, and that is obtained through pKa=−logKa
The procedure is very similar for weak bases. The general equation of a weak base is
BOH⟺B++OH−(3)
Solving for the Kbvalue is the same as the Ka value. You use the formula
Kb=[B+][OH−][BOH](4)
The pKb value is found through pKb=−logKb
The Kw value is found withKw=[H3O+][OH−].
Kw=1.0×10−14(5)
What is the equilibrium constant expression for the following reaction?
COCl2(g) = CO(g) + Cl2(g)
Answer:
Kc = [CO][Cl₂]/[COCl].
Kp = P(CO)P(Cl₂)/P(COCl).
Explanation:
For the balanced reaction:
COCl₂(g) ⇄ CO(g) + Cl₂(g).
The equilibrium constant can be expressed as concentration equilibrium constant (Kc) or pressure equilibrium constant (Kp).
The equilibrium constant is the ratio of the product of products concentrations to the product of the reactants concentrations.
Kc = [CO][Cl₂]/[COCl].
Kp = P(CO)P(Cl₂)/P(COCl).
The equilibrium constant expression for the decomposition of COCl₂(g) into CO(g) and Cl₂(g) is K = [CO][Cl₂] / [COCl₂], with each species' concentration raised to the power of their respective stoichiometric coefficients, which are all 1 in this reaction.
The equilibrium constant expression for the reaction COCl₂(g) = CO(g) + Cl₂(g) is based on the concentrations of the products and reactants at equilibrium. According to the law of mass action, the equilibrium constant expression for a reaction is the ratio of the product of the concentrations of the products raised to the power of their stoichiometric coefficients to the product of the concentrations of the reactants raised to the power of their stoichiometric coefficients. For the given reaction, the equilibrium constant expression would be:
K = [CO][Cl₂] / [COCl₂]
In this case, the products are CO and Cl₂, and both have a coefficient of 1. The reactant is COCl₂, also with a coefficient of 1.
Choose the products that complete the reaction. The chemical equations may not be balanced.
The products that complete the reaction between hydrochloric acid (HCl) and sodium hydroxide (NaOH) are water (H₂O) and sodium chloride (NaCl).
Explanation:In the given chemical equation, HCl + NaOH, hydrochloric acid (HCl) reacts with sodium hydroxide (NaOH) to produce water (H₂O) and sodium chloride (NaCl). This reaction is a classic example of an acid-base neutralization reaction. The hydrogen ion (H⁺) from the acid combines with the hydroxide ion (OH⁻) from the base to form water, and the remaining ions, sodium (Na⁺) from the base and chloride (Cl⁻) from the acid, combine to form sodium chloride.
The balanced chemical equation for this reaction is:
HCl + NaOH → H₂O + NaCl
This equation illustrates the conservation of mass, with the same number of atoms of each element on both sides of the equation. The coefficients in the balanced equation indicate the stoichiometry of the reaction, showing the molar ratios between the reactants and products. In this case, one mole of hydrochloric acid reacts with one mole of sodium hydroxide to produce one mole of water and one mole of sodium chloride.
It's important to note that in a balanced chemical equation, the number of atoms of each element must be the same on both sides. This ensures that the law of conservation of mass is satisfied, meaning that no atoms are created or destroyed during the chemical reaction. In the case of the reaction between HCl and NaOH, the balanced equation accurately represents the chemical changes that occur during the neutralization process.
Full Question:Choose the products that complete the reaction. The chemical equations may not be balanced. HCL + NaOH →?
a kind of nonfoliated metamorphic rock
A) coal
B) limestone
C) marble
D) Slate
[D is incorrect]
Answer: C
Explanation:
Non-foliated metamorphic rocks such as hornfels, marble, quartzite, and novaculite do not have a layered or banded appearance.
Slate is a kind of nonfoliated metamorphic rock. Option D is correct.
Foliated metamorphic rocks have a layered appearance, while nonfoliated metamorphic rocks do not. Slate is a type of nonfoliated metamorphic rock that is formed when shale is subjected to high pressure and heat. Shale is a sedimentary rock that is made up of fine-grained particles of clay and silt.
When shale is subjected to high pressure and heat, the particles in the shale are recrystallized and aligned in parallel layers. This gives slate its characteristic smooth, even texture. Slate is often used for roofing, blackboards, and flooring. It is also a popular material for sculptures and other decorative items. Option D is correct.
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Adding a catalyst to a reaction would increase which quantity?
A. grams of product produced in an hour
B. grams of product at the end of the reaction
C. concentration of product at the end of the reaction
D. concentration of reactants at the end of the reaction
Answer:
A. grams of product produced in an hour
Explanation:
Catalysts are substances that speed up chemical reactions. They do so by lowering the activation energy of the reactants, minimum energy required to start a chemical reaction.Therefore, catalysts speed up the rate of reaction by lowering the activation energy of the reactants. This means catalysts will have no effect on the concentration of products or reactants and therefore the yield remains the same.Hot, arid climates, such as deserts, are prone to erosion by A. Living organisms B. Ice C. Wind D. Moving water
Answer:
Explanation:
C wind
Answer:
C. Wind
Explanation:
Hot, arid climates, such as deserts are prone to rigorous erosion by wind.
These climates have no vegetation cover and barely no trees. This makes them exposed to wind action. We also know that precipitation all year round is very low and erosion by water would be near impossible.
Most of the surface features of deserts like dunes, Yardangs, Brachans all points to rigorous wind erosion over a long period of time.
The amount of loose sands on surfaces of deserts also makes its easy for the effectiveness of wind erosion in those climatic regions.
Carlos has some soil that has too much sand mixed in for growing plants. What should he add to improve the soil for growing plants? A) bugs B) clay C) pebbles D) twigs
I’m not sure but it’s most likely not A.
Answer:B: clay
Explanation:
PLEASE HELP WILL MARK BRAINLIEST!!!Which balanced equation represents an oxidation-reduction reaction? (explain)
(1) Ba(NO3)2 + Na2SO4 ==> BaSO4 + 2NaNO3
(2) Fe(s) + S(s) ==> FeS(s)
(3) H3PO4 + 3KOH==> K3PO4 + 3H2O
(4) NH3(g) + HCl(g)==> NH4Cl(s)
Answer:
(2) Fe(s) + S(s) → FeS(s)
Explanation:
The oxidation-reduction reaction contains a reductant and an oxidant (oxidizing agent).An oxidizing agent, or oxidant, gains electrons and is reduced in a chemical reaction. Also known as the electron acceptor, the oxidizing agent is normally in one of its higher possible oxidation states because it will gain electrons and be reduced.A reducing agent (also called a reductant or reducer) is an element (such as calcium) or compound that loses (or "donates") an electron to another chemical species in a redox chemical reaction.The only reaction that include oxidant and reductant:(2) Fe(s) + S(s) → FeS(s).
Fe is oxidized to Fe²⁺ in (FeS) (loses 2 electrons). "reducing agent".
S is reduced to S²⁻ in (FeS) (gains 2 electrons). "oxidizing agent".
The first reaction: (1) Ba(NO3)2 + Na2SO4 ==> BaSO4 + 2NaNO3
is replacement reaction.
The third reaction: (3) H3PO4 + 3KOH==> K3PO4 + 3H2O
is acid-base reaction.
The fourth reaction: (4) NH3(g) + HCl(g)==> NH4Cl(s)
is synthesis reaction.
The balanced chemical equation which represents a redox reaction is:[tex]Fe_(_s_)+S_(_s_) \rightarrow FeS_(_s_)[/tex] as it includes an oxidant and a reductant. The correct option is 3.
Redox reactions comprise of two parts a reduced part and an oxidized part, which occur simultaneously . The part which is reduced gain electrons and hence there is a increase in oxidation state of the species.
While, the part which is oxidized looses electrons and hence there is a decrease in oxidation state of the species.During redox reactions, there is no net change in the number of electrons . Electrons which are given off in oxidation are used up in reduction.
The ion or molecule which accepts electrons is called as oxidizing agent while the ion or molecule which donates electrons is called as a reducing agent.The only reaction which is an oxidation-reduction reaction is that of iron and sulfur where iron is oxidized and sulfur is reduced.
Thus, the correct option is 3.
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What is quantum physics
It has to do with time travel
Final answer:
Quantum physics is a branch of physics focusing on the behavior of matter and energy at atomic and subatomic levels, defining energy, momentum, and other quantities in discrete values. It introduces the wave-particle duality of quantum particles and quantization, where energy is exchanged in fixed quanta.
Explanation:
Introduction to Quantum Physics:
Quantum physics, also known as quantum mechanics, is a fundamental theory in physics that explains the behavior of matter and energy at the atomic and subatomic levels. Unlike classical physics, which adequately describes the motion of macroscopic objects, quantum physics is essential for understanding phenomena that occur at extremely small scales where wave-particle duality and quantization become significant. The quantization aspect of quantum mechanics means that energy, momentum, and other quantities of a system can only take on discrete values.
It's this branch of physics that reveals the dual nature of particles, such as electrons, acting both as particles and as waves. This duality is one of the many counterintuitive aspects of quantum mechanics that do not align with everyday experiences and observations. In the world of quantum mechanics, particles gain or lose energy in fixed amounts called quanta. The field also delves into the strange properties and behaviors of quantum entities, predicting probabilities rather than certainties.
Understanding quantum mechanics is crucial for a variety of applications, including the study of atoms, construction of lasers, and the development of quantum computers. It's a field that continues to challenge our perceptions of reality and pushes the boundaries of what we consider possible in the physical world.
What happens to an oxidizing agent during a redox reaction?
Answer:
An oxidizing agent, or oxidant, gains electrons and is reduced in a chemical reaction. ... A reducing agent is oxidized, because it loses electrons in the redox reaction.
Explanation:
An oxidizing agent, or oxidant, gains electrons and is reduced in a chemical reaction. ... A reducing agent is oxidized, because it loses electrons in the redox reaction.
What is the definition of physical science?
Answer:
The definition of physical science is the sciences concerned with the study of inanimate natural objects, including physics, chemistry, astronomy, and related subjects.
Explanation:
Answer:
The branch of science which involves the studying of the non-living systems is known as physical science.
Explanation:
The branch of science which involves the studying of the non-living systems is known as physical science.
The further classification of physical science is:-
PhysicsChemistryAstronomyEarth scienceIt is different from life science which involves the study of the living things. Physical science helps to study various phenomenon occurring in our day to day lives.
What chemical process must always accompany a reduction process?
Answer:
Explanation:
That would be the redox reactions . Such reactions only occur when you have a two half cells ,one of the half cells called anode carry oxidation reaction ( the losing of electrons ) and these electrons are then transferred up to the other half cell called cathode where reduction happens (gain of electrons ). Electrons from the anode are transferred up to the cathode and are reduced
How do you know which to pick?
Answer:
[tex]\boxed{\text{(C)}}[/tex]
Explanation:
The solid consists of positive and negative ions, so it is an ionic solid.
Ionic solids are brittle, usually water-soluble, and poor thermal conductors as solids. Thus, the correct answer is [tex]\boxed{\textbf{(C)}}[/tex].
(A) is wrong. It describes a covalent solid, which is soft and always a poor conductor.
(B) is wrong. It describes a covalent solid, which is also low-melting.
(D) is wrong. It describes a metal, and a metal does not contain negative ions.
The absolute temperature of a gas is increased four times while maintaining a constant volume. What happens to the pressure of the gas?
Answer:
The pressure of a gas increases four times, when the absolute temperature is increased four times, while maintaining the volume constant.Explanation:
The expression that rules the change of temperature of ideal gases at constant volume is the Law of Gay-Lussac: pressure and temperature of gases are directly related. In the form of equations that is:
P / T = constantP₁ / T₁ = P₂ / T₂ .......... [equation 1]The question states that the absolute temperature is increased four times, the you can write that as T₂ = 4 × T₁, and substitute in the equation 1 to obtain:
P₁ / T₁ = P₂ / (4 × T₁)Simplify:
P₂ = P₁ × 4 × T₁ / T₁ = P₁ × 4That proves that the pressure also increases four times, when the absolute temperature is increased four times, while maintaining the volume constant.
Answer: The pressure will also increase 4 times.
Explanation:
To calculate the final temperature of the system, we use the equation given by Gay-Lussac Law. This law states that pressure of the gas is directly proportional to the temperature of the gas at constant pressure.
Mathematically,
[tex]\frac{P_1}{T_1}=\frac{P_2}{T_2}[/tex]
where,
[tex]P_1\text{ and }T_1[/tex] are the initial pressure and temperature of the gas.
[tex]P_2\text{ and }T_2[/tex] are the final pressure and temperature of the gas.
We are given:
[tex]P_1=p\\T_1=t\\P_2=?=\\T_2=4t[/tex]
Putting values in above equation, we get:
[tex]\frac{p}{t}=\frac{P_2}{4t}\\\\P_2=4p[/tex]
Hence, the pressure will also increase 4 times.
If a chemical reaction uses up energy the reaction is
Answer:
Chemical reactions often involve changes in energy due to the breaking and formation of bonds. Reactions in which energy is released are exothermic reactions, while those that take in heat energy are endothermic.
Explanation:
It’s an endothermic reaction
- 20 points.
- Im struggling in chemistry, please help only if you’re serious about it! Thank you!!
Describe the progression of a reaction using the graph below. Start with reactants and proceed through products. Make sure you talk about the following terms: Reactants, Activation energy, Transition state, and Products. Is this reaction exothermic or endothermic?
A reaction, such as this one, starts with a reactant. It needs to have activation energy in order to change to the product, as shown by the hump in the graph. At the top of the hump is the transition state. This is the point where, after enough energy, the reactant will turn into the product. This reaction is exothermic. Since the product has less energy than the reactant, it had to have released energy somehow, and that energy was released in the form of heat, which makes it exothermic. (Exothermic reactions release heat, vs. endothermic reactions which absorb heat).
Bonus: a catalyst can be used to lower the activation energy by giving the reaction a “kick start,” requiring less energy in the reaction for the reactant to turn into the product.
-Lemme know if I can do anything else!
A student attempts to measure the specific heat capacity of an unknown liquid through repeated trials. She measures its specific heat capacity, in J/g•°C, as 2.14, 2.11, 2.13, 2.12, and 2.11. The specific heat capacity of the liquid should be recorded as -
The specific heat capacity of the liquid should be recorded as 2.12.
What is specific heat?The amount of energy needed to raise the temperature of one gram of a substance by one degree Celsius.
By specific heat equation
[tex]Q = mc (T - T_\circ)[/tex]
By knowing the temperature difference, the mass and the c, we can calculate the specific heat capacity.
To calculate the specific heat capacity, we will calculate the average
the data is given 2.14, 2.11, 2.13, 2.12, and 2.11.
2.14 + 2.11 + 2.13 + 2.12 + 2.11 = 10.61
then 10.61 divided by 5
10.61 / 5 = 2.122
Thus, the correct option is D. 2.12
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Final answer:
The average specific heat capacity of the unknown liquid measured through multiple trials is 2.12 J/g°C, which is the value rounded to three significant figures.
Explanation:
The student has measured the specific heat capacity of an unknown liquid through multiple trials and has obtained the values 2.14, 2.11, 2.13, 2.12, and 2.11 J/g°C. To report the specific heat capacity, one would usually calculate the average. Thus, adding these measurements together and dividing by the number of trials gives the average specific heat capacity of the liquid:
(2.14 J/g°C + 2.11 J/g°C + 2.13 J/g°C + 2.12 J/g°C + 2.11 J/g°C) / 5 = 10.61 J/g°C / 5 = 2.122 J/g°C.
However, we round this to three significant figures, which is the precision of the measured values, giving 2.12 J/g°C as the recorded specific heat capacity of the liquid.
This is a physical combination of one substance dissolved in another.
Answer:
Solution is a physical combination of one substance dissolved in another.Explanation:
A solution is a homogeneous mixture.
The solutions are characterized by uniform composition and one phase, but they can be either solid, liquid or gases.
In a solution there is, at least, one solute substance and one or more solvents.
A typical solution is salt and water: salt is the solute, which is dissolved, in water (the solvent).
In a solution, you can not distinguish visually the solute from the solvent, but, since they are physically, and not chemically, combined, they can be separated by physical media, e.g. evaporation.
Answer: Solution is the correct answer!
What is the name of the opposite stereoisomer of the molecule shown below?
A. trans-2-pentene
B. 2-ethylpropane
C. cis-2-pentene
D. 1-propene
Answer:
the answer is d hope this helps
and dont forget to mark me as brainliest
Explanation:
Trans-2-pentene is the name of the opposite stereoisomer of the molecule shown in the figure. Hence, option A is correct.
What is a stereoisomer?Stereoisomers are isomers that have the same composition but that differ in the orientation of those parts in space.
When two or more compounds differ in the position of substituent atom or functional group on the carbon skeleton, they are called position isomers and this phenomenon is termed as position isomerism.
Pent-2-ene and pent-l-ene are position isomers because differ in the position of double bond.
The two stereoisomers are (Z)-pent-2-ene and (E)-pent-2-ene.
Hence, option A is correct.
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What law states that the physical and chemical properties of the elements are periodic within the sequence of their atomic numbers?
Atomic Law
Periodic Law
Octet Law
Valence Law
Answer:
Periodic Law.
Explanation:
The Periodic Law states that the physical and chemical properties of the elements repeat in a systematic and predictable way when the elements are arranged in order of increasing atomic number.
Many of the properties are repeated at intervals.
When the elements are arranged correctly, the trends in element properties become apparent and can be used to make predictions about unknown or unfamiliar elements, simply based on their placement on the table.
Answer:
Periodic Law
Explanation:
As you may remember, NaCl is an ionic compound composed of Na+ and Cl− ions. In the oxidation-reduction reaction to form NaCl, which substance is oxidized and which is reduced?
A. Sodium is oxidized and chlorine is reduced.
B. Sodium is reduced and chlorine is oxidized.
C. Both sodium and chlorine are oxidized.
D. Both sodium and chlorine are reduced.
Answer: Option A
Explanation: 2 Na + Cl2---> 2NaCl
Here Oxidation no of Na is zero while in NaCl is +1. That means oxidation state of Na increased from 0 to +1 hence oxidation
While Cl2 has zero in molecular form and -1 in NaCl hence Reduction (Oxidation no decreased from zero to -1)
Halogens(cl) always shows -1 oxidation state and IA group elements(Na)shows +1 oxidation state
The hydrogen ion concentration is 1 × 10-7. What is the ph of this solution?
Answer:
The pH of the solution is 7Explanation:
The pH is a measure of the acidity of the solutions. It is defined as the negative logarithm of the molar concentration of hydrogen ions (H⁺).
pH = - log [H⁺]The hydrogen ion concentration of this solution is 1 × 10⁻⁷ M.
Hence:
pH = - log (1 × 10⁻⁷) = - (-7) = 7This pH corresponds to a neutral solution (neither acid nor alkaline).
You should remember this relation bwtween pH and acidity/alkaliinity:
Low pH (0.0 or close) corresponds to strong acidsHIgh pH (14.0 or close) corresponds to strong basesAcids have pH between 0.0 and 7.0Bases have pH between 7.0 and 14.0What names are listed on the vietnam veterans memorial monument?
There are the names of more than 58,000 men and women who gave their lives or remain missing.
Chlorine (cl) has an atomic number of 17. it often forms an ion by gaining 1 electron. what would its charge be?
Answer:
= -1
Explanation:
Chlorine belongs to the halogen group in the periodic table. It has an atomic number of 17, which indicates the number of protons and electrons in a neutral atom of chlorine is 17.Therefore; with an atomic number of 17, its electronic configuration will be 2:8:7. Thus; to attain a stable configuration chlorine requires to gain one electron, by so doing it becomes a negatively charged ion with a charge of -1.Explanation:
When a neutral atom tends to gain an electron then it acquires a negative charge. Hence, an anion is formed.
For example, atomic number of chlorine is 17 and its electronic distribution is 2, 8, 7.
So, in order to attain stability it tends to gain one electron from a donor atom. Therefore, a chlorine ion is formed as [tex]Cl^{-1}[/tex].
Since, it gains only one electron that is why, -1 charge occurs. Whereas if an atom gains two electrons then it acquires a -2 charge and so on.
Thus, we can conclude that chlorine (Cl) has an atomic number of 17. It often forms an ion by gaining 1 electron. Its charge be -1.
This is a temperature where the vapor pressure of a liquid equals the atmospheric pressure.
Answer:
The answer is boiling point.
Explanation:
The boiling point of a substance refers to the temperature at which the vapour pressure of a liquid equals the atmospheric pressure; at this point the liquid will boil. Different liquids have different boiling points that are unique to them. This makes it possible for scientists to use boiling points as one of the criteria by which a liquid substance can be identified. At boiling point, the chemical bonds that are holding liquid particles together are destroyed and the liquid turn to gas.
The heaviest known isotope of hydrogen is called tritium, . it decays by beta emission, and has a half-life of 12.3 years. what fraction of a tritium sample will remain after 5.20 years?
Answer:
= 3/4
Explanation:
Half life is the time taken by a radioactove element to decay by half of its original mass.
The half life of tritium is 12.3 years , therefore it would take 12.3 years for tritium to decay to a half its original mass.
Using the formula;
New mass = Initial mass × (1/2)^n ; where n is the number of half lives.
n = 5.2 years/12.3 years
= 52/123
Therefore;
New mass = 1 × (1/2)^(52/123)
= 0.74599
= 0.75
The fraction of a tritium sample after 5.20 years will be approximately 3/4
Identify the compound with polar covalent bonding. identify the compound with polar covalent bonding. ar nh3 k kf h2
Answer:
polar nh3, kf and nonpolar h2, ar, kNH3 (ammonia) has polar covalent bonding due to the unequal sharing of electrons between nitrogen and hydrogen.
Explanation:The compound that has polar covalent bonding is NH3 (ammonia). In NH3, the nitrogen atom forms covalent bonds with three hydrogen atoms. However, the nitrogen atom is more electronegative than hydrogen, meaning it has a higher affinity for electrons. As a result, the nitrogen atom attracts the shared electrons more strongly, creating a partial negative charge on the nitrogen atom and a partial positive charge on the hydrogen atoms. This uneven distribution of charge makes NH3 a polar molecule.
The combustion of ethene in the presence of excess oxygen yields carbon dioxide and water: c2h4 (g) + 3o2 (g) → 2co2 (g) + 2h2o (l) the value of δs° for this reaction is ________ j/k⋅mol.
Answer:
[tex]\boxed{-267.5}[/tex]
Explanation:
You can calculate the entropy change of a reaction by using the standard molar entropies of reactants and products.
The formula is
[tex]\Delta_{r} S^{\circ} = \sum_n {nS_{\text{products}}^{\circ} - \sum_{m} {mS_{\text{reactants}}^{\circ}}}[/tex]
The equation for the reaction is
C₂H₄(g) + 3O₂(g) ⟶ 2CO₂(g) + 2H₂O(ℓ)
ΔS°/J·K⁻¹mol⁻¹ 219.5 205.0 213.6 69.9
[tex]\Delta_{r} S^{\circ} = (2\times213.6 + 2\times69.9) - (1\times219.5 + 3\times205.0)\\\\= 567.0 - 834.5 = \boxed{-267.5 \text{ J}\cdot\text{K}^{-1} \text{mol}^{-1}}[/tex]
The value of ΔS for the given reaction is –267.5 J/Kmol
The value of ΔS for the reaction given above can be calculated by using the standard entropies of the reactants and products.
The standard entropies for each compounds are given below:
ΔS for C₂H₄ = 219.5 J/Kmol ΔS for O₂ = 205.0 J/Kmol ΔS for CO₂ = 213.6 J/Kmol ΔS for H₂O = 69.9 J/KmolThus, we can obtain the change in the entropy, ΔS for the reaction as illustrated below:
C₂H₄ + 3O₂ —> 2CO₂ + 2H₂O
Change in entropy = entropy of product – entropy of reactant
ΔS = ΔSₚ – ΔSᵣ
ΔS = [(2×213.6) + (2×69.9)] – [(1×219.5) + (3×205)]
ΔS = [427.2 + 139.8] – [219.5 + 615]
ΔS = 567 – 834.5
ΔS = –267.5 J/Kmol
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Is the equation below balanced? Explain your answer. Zn(OH)2 + NaOH → Na2ZnO2 + H2O
Answer:
No, it is not balanced.
The balanced equation is: Zn(OH)₂ + 2NaOH → Na₂ZnO₂ + 2H₂O.
Explanation:
To balance the equation, you should apply the law of conservation of mass for the equations.The law of conservation of mass states that the no. of each atom is equal in both sides (reactants and products).For the given equation: Zn(OH)₂ + NaOH → Na₂ZnO₂ + H₂O.The no. of Na atoms in reactants side is 1 but in products side is 2.
The no. of H atoms in reactants side is 3 but in product side is 2.
So, the equation is not balanced.
The balanced equation is:
Zn(OH)₂ + 2NaOH → Na₂ZnO₂ + 2H₂O.
The no. of all atoms is the same in both of reactants and products side.
Zn (1), O (4), H (4), and Na (2).
Final answer:
The chemical equation Zn(OH)2 + NaOH ⇒ Na₂ZnO₂ + H₂O is not balanced because there is a discrepancy in the number of oxygen atoms on each side of the equation.
Explanation:
The question asks to verify if the chemical equation Zn(OH)₂ + NaOH ⇒ Na₂ZnO₂ + H₂O is balanced. To determine if the equation is balanced, we count the atoms of each element on both sides of the equation. A balanced chemical equation has an equal number of each type of atom on both sides. For this equation, we see on the left side there is one zinc atom, two sodium atoms, four oxygen atoms, and two hydrogen atoms. On the right side, there is one zinc atom, two sodium atoms, three oxygen atoms, and two hydrogen atoms. Since there are different numbers of oxygen atoms on each side, the equation is not balanced.
How do you do this question?
Answer:
Explanation:
Interesting way to teach molarity. Count the number of Black dots in Vessel 1. There are 4. There are also 4 clear dots. The number Ks = Cls
The molarity is 4 units of KCl/volume of vessel 1.
Now look at vessel 2. All you need do is count the black dots. There are fewer of them
There are 8 by my count. The volume hasn't changed but the black dots have doubled. That means there are 8 units of CaCl2 / volume of Vessel 2 (which is the same volume as Vessel one.)
The answer cannot be anything but D.
Before you count the clear dots in vessel two, make a guess of how many there should be. Notice the formula for CaCl2 has a two in it. Make your best guess and count away.